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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d94b75c2e9e7aeb565534e15c57bbbb631d607a492eb6cfc988733157eadfde' 
  AND token = 'qG5JzagaeRyAXCzxUFdJJnb7HPetN8L4EvIFrKWyxfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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