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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6883fa11b4b0e0c10cc083ff2998560e1c61c1fa39f0d5f7aa76a3e9477c7dd2' 
  AND token = 'LUjlvqCRLQmXixNGg57qMt5JQblAteSb1ghJzJTpNco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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