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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87fb4c9378b1f0576a5b7a5f3ee5c3c6fb3ab87fa21aaf2f3c218063aa6fb1da' 
  AND token = 'xR4LCIOE6cM8IJXjTO5fWbIi5hVUnNf4ShQOIy6rvYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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