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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc03dfc4c7ee39f50e935debd6662ca92d0dcb6675ff4b396dd758736f7de58' 
  AND token = 'u2s6zMBB1eqvpi/ZKxhsusDp3lc8zwPkmBAl5cg3Gp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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