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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebad2bb88beccac196ea6d6e9b1a659e79f4e1f23bb079cec7cdb26c1ae3d7a1' 
  AND token = 'MfRZ/wt/VFqRfxqhy6UTgA7aGndJenQQzB7zcoq9veU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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