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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '140fd48f46addf7f61f22695e7577f034ee153bdb8220979011b1502019b4e26' 
  AND token = '7Mty1WIY5z1XbHnOmDLPMshHQc03AxK3/sC4mWIgXok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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