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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9c3ae6497f0c4aed4895665b46cd5986d7946fc7335de0a6f1aac4c424d9340' 
  AND token = 'OeWawseOblRtI79EllqNqS6PILaTyvO5BVPgp8o6XqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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