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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '369ef1a436a21f29940d65b47411d307d14d1f8adc5ce6d3c2fec23c3c98b0c7' 
  AND token = 'BFwajD6xoHGrHZ3yfsAp2uUjn9Fstqc4vM4mZuz2Er0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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