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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea62d943ae6ed330a15ce54bdaeb63ae47371feac1824c2aae92cd6d725f9050' 
  AND token = 'PGo4Q9F+DQSo+fIxjQt2AkQTrVHRPYqzSo1e0p5PKFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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