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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda10760613dd9b9b631f901930edc20f5c97711037059b9dbe6f89eb583abe8' 
  AND token = 'yc2NMsg1CCA537crxjiiB3D98stL0A+NTBU5uOrXE8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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