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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efe7e3b51bdf46c81c8c77422424eac59ecb41c6d6b41fc870d8a95b0b6afe26' 
  AND token = 'LgyS6EvZ6bsKWIylsgbK7bh2NYJ9N12O40zRC47CjQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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