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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699ceccafa724045e8d40cd83ce2cae359741494528c3f1b03a470dee84bb781' 
  AND token = 'HSWqbsPV7/gk4d9WF7TzXu12i0tRfACtbpWFXCJJsA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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