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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ccdb19d2351b89dcb6b01f08a9c13926534173c79f58778fdcad2decb33fce0' 
  AND token = 'h0fxjUFP1x0AKnFTQGgsWMkYlXCo4eLt9tnav7lD3FY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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