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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '105e3825ca315a417df00c7dcdad4842ff6cfb7860f5a8dfb119aee15513141b' 
  AND token = 'HKMkz1oTnxM6E3RnuUl/C70Xqliu+5d/Y+GU4aPo/Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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