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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b80a3fc4f5da9c5b0f86832a86001fe1a8f53c2815a43bf72073a496b95b0ae8' 
  AND token = '4ng/OfdfchCkHk1bNs9/R0n0exKKuA4YgWsESSh41z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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