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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81a245f2dc56692c9fcc4341eefc903fdbe4196f58dbb04f0566e940f832b5c0' 
  AND token = 'SxLRQmbq2rG2b081w2kRBOW7SMR42ozozEt1oy2gdwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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