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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991ac477e871dd9707688c422943058bcf413d32cffae73827cf729e388d78ed' 
  AND token = 'xSeXuETlYgjORaFxCuXhLf8cpp1EbdNiiYgld1CyID8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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