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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '906d0b512ea11b13e466ce65f738fc7c05bdf0e149e32ac2810b514528058a5a' 
  AND token = 'NvwhA3/KYJkFx7M9gJqY8nodUEeCOp6H8R0qqo/JRWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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