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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d7476e950b11d89a9ebb308a6830b2a0f3bcb5abcdacb05fa8db43c7b15be4' 
  AND token = 'pcXTEwGknjkCJv9bqqGYttezX2tUgKiPP5jn5yggDh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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