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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0186351803b3c7617f77f5c67cf05c2def102796c182e66fdd7d9aea54e476a0' 
  AND token = 'RRnxFbdTcCtntpFTDNsBM5RS/oC5H0YwF6Z3May/DYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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