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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c36035fe8b987b50c4c4d16bd4e726eb6d8acd02682e1dd01e656e26642900c' 
  AND token = 'xL9fxTK7AL86kkW0+X2KnF+3oTgNww0/UePKFOKKvX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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