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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8054b7f1e595d0b2aa4b308d201d7906297ba58e8e4c9493f9066561bd4b2391' 
  AND token = 'qpqAy48rasiiixcMbO6OgEHhRxTsAn5eoc64IL+1YVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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