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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b469d5bd770638df2e873e7eb97a0d354f0ff6903af62a5095adbab7a1e2e0eb' 
  AND token = 'YAcReruv1sPGCtmRRBDYFSajzOcYgozrO/VIwPPaDps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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