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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e07199bf91fc8b8e1ba5b34387fdc4d8b557e861047b9401286316cb5869a94' 
  AND token = '0aXVjMocKZ2Ppu6EL875NkeZp/KRHp0lGU77lXD3Pm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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