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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42abdb76765ea527b65813b125389509dcfd1c1aed136faa916d7d324a124f9c' 
  AND token = 'n8mne5WznTyyItvWmHXjr2gyjfsKZPmpWD6DeefdCR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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