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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b98ebadd92f218a15ec8c3d62f31a9d216eb020cc437b2aa26646bbb3f813eb9' 
  AND token = '6i9Xs1q/YVUbwbyt6ZMYvYnOQL6E9hNpSHV30tXbkIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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