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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431f64f51502ab443b54569208c667ba8947ac98aa1f4731afdfd59bb44da550' 
  AND token = 'tL1L0+31Z4m1foUMyUVZrGPuH33gI82GoadWziweGQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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