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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20745277ed4f040468b5764fc7f7f260f676cbae118f37c8875cf21f538191a6' 
  AND token = 'C/y8qBr8cOnfU+i27GcsyzKEPySaBb7xU/HTsbp4Omc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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