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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e92644be03665b566a30b2b1696abcbb182ebc3fc4266de6995d1aa45e79cfe' 
  AND token = 'PC6SzhkKkcqNCtG3N9Eqf4PqOV63h3Y9IY3DR0edmB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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