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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbee4c6ba36de35ef686eea7bc124df9c5d6993c05ede7dabbd91b2b6a5b0774' 
  AND token = 'uz2BBPq0ZwhDKbWn5MOJ84qm7x/LT2Xo0iowx/2995M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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