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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfe99bac86612dd5d1bc30f1798877d5048f2b2c2607026bab47f51f0770b351' 
  AND token = '5AFIR7UZAcx+6Ee3+CqDalckKnv4KoiLLVtY/JK0htk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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