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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e57f32385f74dac3106e065849f50c51d240430470d80c32586929ac10d161' 
  AND token = '8Dae6urxRVvssagX2s0CXBxXL2BMRpBxS50rl1sGkHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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