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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7eb6f0b0960d3bc4462719a505bc993046f7959a2c3b8490fcad2de3ff4cf92' 
  AND token = '5+bPWEaPjYiiqk5RLyjHv1BSX6Yw+hvxrZ2k96KESeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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