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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84560d2fdcd66fb3adf108eb8fb9ae152c3c4c14919d1f2340f766fb505980c' 
  AND token = 'OMG7bkKbQc0lmElGxbKnE/J7JDJAISDabk+DfrmUGBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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