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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06f0386c333e16a67ec0628f0d438e1d739b3af29b02b613658f15defdf66c80' 
  AND token = 'f019kG6abAxWM+1HagFWwm7OoZ/ulabh9EyMGHpSZqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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