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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4134e3954767746bf6ace61c1056d0cea79aa5d1ce7a565b3d26bcbf4aaaa558' 
  AND token = 'zkQksK3Ae7ygpD6IvzrUUyJ1Tc6hfNAbtvyE+9s+RI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}