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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '532b5ceaa56452b5679373ea0e1bd69d679fad344c8ae9c8a36ed4a1d778b19c' 
  AND token = 'V4RZvIc0xExtgRH7ws2cTYsEzF/AvqvSRYlj2iqubYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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