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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca76657b9c2f81354893537646b995d76781a6a31b92d99745a508e5f042c1a0' 
  AND token = '80YwevplKKXaJkL3cMViXXbCl9k+ltq2QXX34iEN8EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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