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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66d344a447a7a2d6385f12ee753391a1878617315eaaadfbf75584f237c1f83e' 
  AND token = 'jEqdlR7x/GU1O8w/7oIvH7/TH0wFo2pdBMR9XLWzRAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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