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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a77b4e423aea2b666145599b5a2498cb528df0fca1221c3c222350bcffccaa6' 
  AND token = '2JC3k9rs1b4nc+UTLPfLKH933n3SJ14i+fRWiX3GRXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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