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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '106e327a396e5e8174a1b19266b51092e38a8a974fee648d26e4ad592f0c50a7' 
  AND token = 'g1WYpR5jaV82C1Q0IKu0t0+qkOxFob/ZSiWoBMxTVI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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