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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c11b9f53c8823619a314759c1e9a141468a3ed67b320a7b27b3bfb08cf0ec6b' 
  AND token = 'nZ1K5SKRg3SoUReDzMe3Kn0P5Cg00AFftCW9SlgaCjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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