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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fcd030acad70aaed3368d01cdcb13ff30f04b7f549962f8eed3468a5bc62d5c' 
  AND token = 'vu2Q5y3apk2OfdpM4Yn00/VvH+RyvtQcAeSshP0J1eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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