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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cbef1ff171c13a89ded745d6e5addefcd6694bbabc28ff57c05ec5ba62b6b34' 
  AND token = 'd3jAhHaLMQ7tvcc6m8NDdJA5Gg6lDfmSKO2NMDM5TSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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